The 26-year-old reality TV star explained that she has barely left her apartment since she attended the singer's funeral last week.

Speaking to US chatshow host Jay Leno on The Tonight Show, Osbourne said: "I've not really left my apartment much since I've been back from her funeral in London last week ... but it's been good to leave it today, because my air conditioning is broken.

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"I don't really want to go into it, because there will be floods of tears on the couch."

However, Osbourne said that she has had great support from Madonna's 14-year-old daughter Lourdes Leon, who she became friends with while working alongside the teen on her 'Material Girl' fashion line.

Osbourne added: "I will say I've found a great friend in Lourdes.

"I think that she's unbelievably intelligent, and working with her, and seeing how smart someone so young is kind of puts you to shame when you're not that smart."